Ohm's law and resistance
 1) Which Law explains the following? At constant temperature the current flowing through a conductor is directly proportional to the potential difference between its ends. Boyle’s Law Charle’s Law Joule’s Law Ohm’s Law

 2) What does the current through a wire depend on? The potential difference applied. The thickness of the wire. The resistance of the wire. Both resistance and potential difference.

 3) You are measuring the current in a circuit that is operated on an 18 V battery. The ammeter reads 40 mA. Later you notice the current has dropped to 20 mA. How much has the voltage changed? 9 v 36 v 0 v 18 v

 4) What is the shape of V v/s I graph for a linear resistor? Parabola Straight line Hyperbola None of these

 5) Which of the following represent ohm’s law? Current = Resistance × potential difference. None of these Potential difference / current = Resistance Current = Resistance / Potential difference

 6) What is the potential difference required to pass a current of 5A through a metallic rod of resistance 10Ω? 50V 5V 0.5V 0.05V

 7) Choose the correct statement from the alternatives? Every material has resistance. Resistance of a material is the measure of how much it opposes the passage of free electrons. The resistance of a material is independent of the current passing through it. All of them are true

 8) What is the resistor value in the given circuit? 200 Ω 1 k Ω 2 k Ω 4 k Ω

 9) Which one of the following is the resistivity of gold wire? 1.59 x 10¯⁸ Ωm 2.82 x 10¯⁸ Ωm 2.44 x 10¯⁸ Ωm 100 x 10¯⁸ Ωm

 10) If the voltage across a fixed value of resistance is increased five times, what will be the variation in current? Increases to a factor of five Remains fixed Become doubled Decreases to a factor of five

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